The usual optical beams can be described as localized (e.g., bell-shaped) waves in space with rapidly decreasing intensity at increasing distances from the beam axis. Examples of such beams are Gaussian beam and hyperbolic-secant beam (see Fig.2a), which we often denote as “bright beams”...
A 20 × 20 mm2region of the coated face was scanned by the S4read head in steps of 0.25 mm, giving a total of 8181 points over the ROI. Emission spectra were measured at these points with laser polarization both parallel and perpendicular to the compression axis to probe strain along...
. We used a InGaAs camera (OW1.7-VS-CL-LP-640, Raptor Photonics) with exposure time of 20 μs and a maximal frame rate of 120 Hz, and employed off-axis digital holography to record the complex-valued fields emitted from the fiber output facet in response to all possible MMF input...
Eq. (2) provides the rotation matrix for pan/tilt motions where the z-axis represents the principal axis, the x-axis is positive, right and the y-axis is positive, down. Pre-multiplying a set of points in global coordinates by the rotation matrix, R, then gives the new locations of ...
With this method in principal also the defocus caused by the Gaussian beam profile along the z-axis can be numerically compensated. For more details the reader may refer to the references [34,35,36]. 3.4.7 High Speed OCT Since the beginning of the clinical use of OCT imaging devices in ...
TELECENTRIC LENS SYSTEM FOR PROVIDING AN IMAGE WITH THE PRINCIPAL RAYS PARALLEL TO THE OPTICAL AXIS AND NORMAL TO THE FOCAL PLANE 来自 掌桥科研 喜欢 0 阅读量: 11 申请(专利)号: USD3565511 申请日期: 1969-04-23 公开/公告号: US3565511A ...
In a typical implementation, the polarisation plane of a probe beam is aligned perpendicular to the axis of a polarising element (the “analyser”), and the transmitted light intensity is recorded using a photodetector. A Faraday oscillator of frequency f perturbs the polarisation plane of the ...
axis, respectively. The coordinate system O-x1x2x 3 must be fixed within the bulk specimen so as to make the orien- tation distribution of the crystal grains as highly symmetric as possible with respect to the coordinate axes. Thus, the axes x3 , x 2 , and x1 must be taken parallel ...
The second axis was used to calculate the Poisson’s ratio of the material. A marked specimen can be seen in Figure 1. Figure 1. Prepared ISO 527-2 Type 1A PA6 tensile specimen. To validate the effectiveness of the material models, three different tensile specimen geometries were created ...
of wavelength for different lengths of fiber where γPpL=π. The plots reveal the dramatic increase in the expected bandwidth of operation as the fiber length is decreased. The negative-exponential relationship between the gain bandwidth and fiber length is plotted on the right axis of FIG. 5B....